WO2017002993A1

WO2017002993A1 - Depth-priority integral imaging display system that removes color separation phenomenon

Info

Publication number: WO2017002993A1
Application number: PCT/KR2015/006790
Authority: WO
Inventors: 신동학; 김은수
Original assignee: 광운대학교 산학협력단
Priority date: 2015-07-01
Filing date: 2015-07-02
Publication date: 2017-01-05
Also published as: KR101691297B1

Abstract

The present invention relates to a depth-priority integral imaging display system that removes a color separation phenomenon. More specifically, the depth-priority integral imaging display system comprises: a display panel consisting of red (r), green (g) and blue (b) sub-pixels; a backlight unit, disposed on the rear surface of the display panel, for providing light to the side of the display panel; and a lens array, disposed on the front surface of the display panel, for enabling the sub-pixels of the display panel to expand and pass therethrough, wherein the lens array has elemental lenses which have a rectangular vertical cross-section and are arrayed vertically and horizontally.

Description

Depth-First Integrated Image Display System Eliminates Color Separation

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a depth-first integrated video display system comprising a lens array consisting of a basic lens having a rectangular shape. It is an object of the present invention to provide a depth-first integrated imaging system that eliminates color separation that occurs when a three-dimensional stereoscopic image is formed by forming a basic lens of an array.

Currently, technologies proposed for displaying three-dimensional stereoscopic images include stereoscopic image display, glasses-free stereoscopic image display, and holographic display method using special glasses.

Among these, the autostereoscopic three-dimensional image display method has a parallax barrier method and a semi-cylindrical lens that separate and observe an image through a vertical grid-shaped aperture in front of each image corresponding to left and right eyes. It can be divided into a lenticular (lenticular) method using a lenticular plate in which the array is arranged and an integrated imaging method using a lens array of a fly's eye shape.

Such a stereoscopic image display method is limited to a small number of people due to the fixed viewing range, but it is convenient because no glasses are worn, such as a stereoscopic image display method by special glasses, and is easier to implement than a holographic display method. Among them, more preferred.

Among them, the integrated imaging technology displays a three-dimensional image by arranging a lens array in front of the display panel, thereby making it simple to use a commercially available display panel and achieving continuous color three-dimensional images within a viewing angle range. It is easy.

The integrated imaging system has two types of structures depending on the arrangement interval of the display panel and the lens array.

Let g be the distance between the display panel and the lens array, and let f be the focal length of the small elementary lens of the lens array.

In this case, g = f is referred to as a depth-priority integrated image, and g ~ = f is referred to as a resolution-priority integrated image.

The two structures differ in display resolution and display depth of the 3D image.

In the prior art of such a three-dimensional integrated image display method, a method of compressing an element image by applying an area segmentation technique to an element image compression apparatus in Patent No. 0891160, (a) from a three-dimensional object through a lens array Obtaining an element image having another parallax; (b) dividing the obtained element image into similar regions having a plurality of similar images according to the similarity of correlation; (c) rearranging the images included in each of the similar regions into a one-dimensional element image array; And (d) compressing the rearranged and generated one-dimensional element image array.

According to another exemplary embodiment of the present invention, in the method of restoring an integrated image by using an element image picked up through a lens array in Korean Patent No. 0942271, the element image is enlarged to a predetermined size, and the enlarged respective elements Generating a reconstructed image by adding pixels located at the same coordinates of the image; Measuring a blur metric value of each reconstructed image; Selecting a reconstructed image corresponding to an inflection point of the blur metric value according to a focal length as a focus image; Generating an erosion image through an erosion operation of subtracting each pixel value of a corresponding erosion mask from each pixel value of the focus image; And a method for mapping the eroded image to the reconstructed image.

However, since the elementary lens used in the lens array of the conventional integrated imaging system is circular, color separation occurs and thus it is impossible to display proper color information.

The present invention has been made to solve the above-described problem, color separation generated when a three-dimensional stereoscopic image is realized through a lens array in a display panel consisting of red (r), green (g), and blue (b) pixels. It is to provide a depth-first integrated imaging system that eliminates the phenomenon.

Depth-first integrated image display system to remove the color separation phenomenon of the present invention is a display panel consisting of subpixels of red (r), green (g) and blue (b), and disposed on the back of the display panel to the light toward the display panel And a lens array disposed on the front of the display panel to enlarge and pass the subpixels of the display panel. The lens array includes a basic lens having a rectangular vertical cross section arranged up, down, left, and right. It is characteristic that there is.

Therefore, the present invention eliminates the color separation that occurs when the three-dimensional stereoscopic image is implemented by forming the basic lens of the lens array in a rectangular shape, thereby providing a three-dimensional image with clear image quality, thereby providing a more three-dimensional image. There is a remarkable effect such as being able to enjoy.

1 is a schematic diagram illustrating the principle of an integrated imaging technique according to the prior art;

FIG. 2 is a schematic diagram illustrating a system of integrated images classified according to arrangement intervals of a display panel and a lens array according to the prior art; FIG.

3 is a schematic diagram illustrating a structure of a depth-first integrated imaging system using a display panel composed of red, green, and blue subpixels according to the prior art;

Figure 4 is a schematic diagram showing a depth-first integrated image display system for removing the color separation phenomenon of the present invention.

FIG. 5 is a schematic diagram showing a display panel and a lens array structure for subpixel enlargement display of a depth-first integrated image display system for removing color separation from the present invention; FIG.

FIG. 6 is a schematic diagram illustrating the positional relationship between a subpixel magnifying lens array and a display panel of a depth-first integrated image display system for eliminating color separation;

7 is a schematic diagram showing a relationship between a unit lens and a subpixel of a display panel.

FIG. 8 is a schematic diagram of exchanging a new element image of a depth-first integrated image display system that removes the present invention color separation from an existing element image. FIG.

9 is a schematic diagram showing an example of an image display for a two-dimensional element image in a depth-first integrated image display system to remove the color separation phenomenon of the present invention.

10 is a schematic diagram showing the principle of imaging of three-dimensional image in the conventional method.

11 is a schematic diagram showing the principle of image formation of a three-dimensional image in the depth-first integrated image display system to remove the color separation phenomenon of the present invention.

100. Image Acquisition Step

110. 3-D object 120. Lens array 130. Elemental image

200. Video playback stage

210. 3D image 220. Lens array 230. Element image

250. Display panel 260. Backlight unit

Depth-first integrated image display system to remove the color separation phenomenon of the present invention is a display panel 250 consisting of subpixels of red (r), green (g) and blue (b) and on the back of the display panel 250 A backlight unit 260 disposed to provide light toward the display panel 250 and a lens array 220 disposed on the front of the display panel 250 to enlarge and pass the subpixels of the display panel 250. In this case, the lens array 220 is characterized in that the vertical lens is a vertical cross-section of the primary lens is arranged up, down, left and right.

In addition, the basic lens of the lens array 220 is characterized in that the three made of one unit lens.

In addition, the primary lens is characterized in that the parallel beam is made by passing the red (r), green (g) and blue (b) light respectively.

Hereinafter, the depth-first integrated image display system for removing the color separation phenomenon of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic diagram illustrating the principle of integrated imaging technology according to the prior art.

First, referring to FIG. 1, basically, the principle of reproducing the 3D object 110 as a 3D image 210 is to allow the 3D object 110 to see the lens array 120 so that the element image 130 may be viewed. Image reproducing step (200) of reproducing the image acquisition step 100 and the element image 100 collected by the image acquisition step 100 to obtain the three-dimensional image 210 in the space again through the lens array 220 (200) It is composed of

That is, the integrated image technology is largely divided into the image acquisition step 100 and the image reproduction step 200 as shown in FIG.

The image acquisition step 100 is composed of a two-dimensional sensor such as an image sensor and the lens array 120, wherein the three-dimensional object 110 is located in front of the lens array 120.

Then, various image information of the 3D object 110 passes through the lens array 120 and is stored in the 2D sensor.

In this case, the stored image is used for reproducing the 3D image 210 as the element image 130.

Afterwards, the image reproducing step 200 of the integrated imaging technology is a reverse process of the image acquiring step 100, and includes an image reproducing apparatus such as a liquid crystal display and a lens array 220.

Here, the element image 230 obtained in the image acquisition step 200 is displayed on the image reproducing apparatus, and the image information of the element image 230 passes through the lens array 220 to the 3D image 210 in space. Will be played.

Subsequently, the element image 130 of the image acquisition step 100 and the element image 230 of the image reproduction step 200 are substantially the same, but the element image 230 of the image reproduction step 200 is the image acquisition step. The element image 120 acquired in (100) is stored in a 2D sensor and used to reproduce a 3D image. For convenience, the element image 120 is distinguished by using different reference numerals to distinguish the image acquisition step 100 and the image reproduction step 200. Shown.

FIG. 2 is a schematic diagram illustrating a system of integrated images classified according to an arrangement interval of a display panel and a lens array according to the related art. In particular, FIG. 2A is a schematic diagram illustrating a depth-first integrated image system, and FIG. It is a schematic diagram showing the video system.

The integrated image method may be classified into two types according to the distance g between the lens array 220 and the element image display apparatus.

That is, the distance g may be divided into a case where the distance g is the same as the focal length f of the base lens of the lens array 220 and a case where the distance g is not.

In the case of g = f, as shown in FIG. 2 (a), one pixel of the element image 230 becomes a parallel beam through the lens to form an integrated beam.

This case is called a depth-first integrated image method, and it is possible to maximize the depth area for displaying a 3D image, but has a disadvantage in that the resolution of the 3D image 210 is low.

On the other hand, when g is not equal to f, it is called a resolution-first integrated imaging method. An integrated beam is formed by converging beams of one pixel of the element image 230 through a lens, and in this case, the 3D image 210. The resolution can be increased, but the depth area is drastically reduced.

3 is a schematic diagram illustrating a structure of a depth-first integrated imaging system using a display panel including red, green, and blue subpixels according to the related art.

Accordingly, referring to FIG. 3, in the depth-first integrated image method using a conventional lens array, when the display panel having a subpixel structure is used in a method of generating one point light source, intensity information of light rays formed as the point light source is restored. This is possible, but there is a problem of reading color information.

As shown in Figure 3 to create a point light source, various color information is collected.

When these point sources are observed by the observer, they do not show the correct color information. This problem is a major cause of color separation.

Therefore, there is a problem that it is difficult to implement a correct three-dimensional image.

As shown in FIG. 4, the depth-first integrated image display system for removing color separation of the present invention includes a display panel 250 including red (r), green (g), and blue (b) subpixels. A backlight unit 260 disposed on a rear surface of the display panel 250 to provide light toward the display panel 250 and an enlarged subpixel of the display panel 250 disposed on the front surface of the display panel 250. It is composed of a lens array 220, the lens array 220 is characterized in that the vertical lens is arranged in a vertical cross-section of the base lens in the vertical, vertical, left and right.

That is, the image of the display panel 250 basically consists of red (r), green (g) and blue (b), and red (r), green (g) and blue (b) are called rgb. In the present invention, the pixel corresponding to the rgb color is called a subpixel.

In addition, a backlight unit 260 is positioned on a rear surface of the display panel 250 as a light source that provides light to the display panel 250. The backlight unit 260 is disposed in front of the display panel 250 and is a subpixel of the display panel 250. It consists of a lens array 220 to pass through.

In particular, in the present invention, the lens array 200 has a basic lens having a vertical cross section of a rectangular shape arranged up, down, left, and right.

In general, the elementary lens is a convex lens.

FIG. 5 is a schematic diagram illustrating a structure of a display panel and a lens array for subpixel enlargement display of a depth-first integrated image display system which eliminates color separation.

On the other hand, in the structure of the existing lens array 220, as shown in Figure 5, unlike the circular or square shape of the same shape of the primary lens is made so that the vertical cross-section has a rectangular structure.

The three rectangular basic lenses thus manufactured are constructed as one unit.

A unit lens having three basic lenses as one unit is called a unit lens, and a lens array 220 composed of such unit lenses is placed on the display panel 250 having a subpixel structure.

FIG. 6 is a schematic diagram illustrating a positional relationship between a subpixel magnifying lens array and a display panel of a depth-first integrated image display system that eliminates color separation.

As shown in FIG. 6, the distance between the lens array 220 and the display panel 250 is equal to the focal length of the base lens of the lens array 220.

Then, the beams (rays) passing through the display panel 250 pass through the respective basic lenses to form parallel beams.

As described above, the unit lens used in the present invention is composed of three small base lenses, and the parallel beams of different colors are made through each base lens.

7 is a schematic diagram illustrating a relationship between a unit lens and a subpixel of a display panel.

7 shows an example in which four subpixels and one elementary lens are matched in one dimension.

This is the same as the case of using a 4 pixel element image (12 subpixel) in the integrated image method in FIG.

In order to display a 3D image according to the present invention, the position of the rgb color should be changed as shown in FIG.

FIG. 8 is a schematic diagram of exchanging a new element image of a depth-first integrated image display system to remove the color separation phenomenon of the present invention from an existing element image.

The principle of swapping pixels is as follows.

The three elementary lenses of the unit lens are arranged by dividing the rgb pixels.

If N pixels (3N subpixels) are converted, the k-th pixel is converted into a subpixel position of (k, k + N, k + 2N), and the swap arrangement is performed according to the rgb color information. .

For example, an element image pixel (12 subpixels) of N = 4 is as follows.

If k = 1, it is connected to the 1st, 5th, and 9th subpixel positions, and it is rearranged according to the color.

Then 1r is converted to the first, 1g to the fifth pixel, and 1b to the ninth pixel.

If K = 2, the second, sixth, and tenth subpixel positions are connected, and when the color positions are rearranged, 2r is connected to the tenth, 2g to the second, and 2b to the sixth.

Even when K = 3 and k = 4d, the same principle can be applied for conversion.

FIG. 9 is a schematic diagram illustrating an example of an image display of a 2D element image in a depth-first integrated image display system that eliminates color separation.

As shown in FIG. 9, when the subpixel magnifying lens array 220 is mounted on the display panel 250, the viewer enlarges one subpixel among the subpixels of the display panel 250 through the lens array 220. Show it.

As shown in FIG. 9 (b), the observer sees an image of rgb type at a short range.

This structure is similar to the form in which each of the display panels 250 of the subpixel structure is enlarged.

Then, the viewer can observe the image to be displayed.

10 is a schematic diagram showing the principle of imaging of a three-dimensional image in the conventional method.

When the observer observes the point image formed through the lens array 220, there is a problem that the color information of the point image to be observed is lost, which is the basic cause of color color dispersion.

FIG. 11 is a schematic diagram illustrating an imaging principle of a 3D image in a depth-first integrated image display system that eliminates color separation.

Unlike the existing method, one point image is divided into color components of rgb, and the imaging principle is applied to each color information.

For example, if an image of a point image of red is made, the image is interpreted by connecting the geometric optical structure of the pixels connected to the subpixel of r in the display panel 250.

In this case, the observer only displays the intensity of the r information without losing color information.

The same principle applies to g and b imaging.

The observer can combine rgb to observe the color and light intensity displayed properly.

In addition, when displaying a three-dimensional image in the image playback step 200, by installing a mask panel on the front of the lens array 220, the element image 230 passes through the lens array 220 and the mask panel to make clear 3 Dimensional images can be displayed.

On the other hand, the mask panel is composed of a blocking region where the element image does not pass and a transmission region through which the element image passes, and the cut area and the transmissive region are alternately positioned with time in order to provide a clearer 3D image. It can be displayed.

When the display panel is displayed in white and the 2D image is displayed on the mask panel, the 2D image is displayed without displaying the 3D image in space, and when the display panel is displayed in white only in a portion of the display panel, Two-dimensional image is displayed in the area of the mask panel corresponding to the white area of the display panel. In the remaining area of the display device panel which is not displayed in white, the element image passes through the lens array and the mask panel and is three-dimensional in space. A method of displaying an image may be selectively implemented.

As described above, the present invention eliminates the color separation that occurs when the three-dimensional stereoscopic image is realized by forming the basic lens of the lens array in a rectangular shape, thereby providing a three-dimensional image with clear image quality, thereby providing a more three-dimensional effect. There is a remarkable effect, such as being able to enjoy 3D images.

Claims

A display panel 250 including red (r), green (g), and blue (b) subpixels; and a backlight unit disposed on a rear surface of the display panel 250 to provide light to the display panel 250. 260 and a lens array 220 disposed on the front of the display panel 250 to enlarge and pass the subpixels of the display panel 250. The lens array 220 has a vertical cross section of a rectangular shape. Depth-first integrated image display system to remove the color separation phenomenon characterized in that the primary lens is arranged in the top, bottom, left and right.
The method of claim 1,

Depth-first integrated image display system for removing the color separation phenomenon characterized in that the base lens of the lens array 220 consists of three unit lenses.
The method of claim 2,

A depth-first integrated image display system of eliminating color separation, characterized in that the parallel lens is made by passing the light of the red (r), green (g) and blue (b) through the base lens.